Hi from Europe ! At first, I am sorry for my bad English. It is very interesting to hear about probability of creation of “Entler” from Endler. But we have other explanation of “Entler” origin. We are living in Czech Republic in Europe centre near Germany. My grandfather and my great-grand father lived under mountains “Krkonose”. On the other side of mountains is Germany and all region was German partly. (In the World War II there were “Sudety”). All our family mans was shoemakers and before they tailors. And that it is. One of the most difficult tailor works is making of needlework and braided lases. In Czech language it named “ENTLOVAT”. Man which did needlework was called “Entl”. Very much German names have ending “er”. Because in “Sudety” was German influence very strong, it could to cause the connection Entl+er = Entler.
In Czech lived about 20 families “Entler”. But we had no documents about history, because two wars, misery and communism erased all.